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When Can You Expect a Personal Record in the Gym?

Tell me if this sounds familiar: You’ve been training to do something—your first pull-up, let’s say—and after weeks or months, you finally make it. Hooray! But the following day or week, you try to do it again, but now you can’t. Did you get weaker? Did your training not actually pay off? Are you a failure? Should you just go lie down and cry?